浅埋小净距隧道桥隧相连段动力响应分析

Dynamic response analysis of bridge-tunnel connecting section with shallow-buried small distance

为了给桥隧相连隧道洞口及其桥隧结合处的施工设计提供参考,以四川省峨眉山市双桥村2号隧道-象鼻子大桥桥隧相连段为工程背景,通过理论分析和数值模拟的方法对桥隧相连结构在地震作用下的动力响应进行分析。采用时程分析方法,通过在水平方向施加El Centro波,分析了桥隧相连结构洞口段在地震动作用下的位移、加速度和应力变化情况。结果表明,地震波作用下,隧道洞口段衬砌结构的变形比静力场中增大了约10%,应力增加了约15%。因此,在对洞口段进行设计时,应着重考虑动力作用对结构的影响,及时对结构复杂易变形部位进行支护。

Based on the research background of the connecting section of Tunnel No.2 in Shuangqiao village,Emeishan city,Sichuan province,and the connecting section of the Xiangbi bridge,the dynamic responseof the bridge-tunnel connecting structure under the action of earthquake were studied through theoretical analysis and numerical simulation.With the time history analysis method,by applying El Centro wave in the horizontal direction,the changes of displacement,acceleration and stress of the opening section of the bridge and tunnel connected structure under the action of ground motion were analyzed.The bridge under different loading directions and loading strengths was compared.It is found that the deformation of the lining structure of the tunnel entrance section under the action of the seismic wave was about 10%larger than that in the static field,and the stress was increased by about 15%.The design of the entrance section should focus on the influence of dynamic action on the structure by timely supporting the complex and easily deformable parts of the structure.